Improvement in furnace-grates



3 SvheetsuSheet I. C. KNBLAUCH.

NITED STATES PATENT Ormea.

CHARLES KNOBLAUCH, OF MUNICH, BAVARIA.

IMPROVEMENT IN FURNACE-GRATES.4

Specification forming part of Letters Patent No. 159, 186, dated January 23, 1875; application tiled June 16, 1874.

To all whom it may concern `Be it known that I, GHARLEs KNoBLAUcH, civil engineer, of Munich, Bavaria, have invented certain Improvements in Furnace- Grrates 5 and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings making a part of the same.

Fire-bars exposed to considerable heat are necessarily made of considerable strength to provide against their bending, and to allow for portions of their upper surface being burned away. They are,l therefore7 usually made broad on their upper surface, with considerable spaces left between them to allow for their horizontal iiexure, and to give room for the removal of burnt or bent bars, and for replacing them by new bars. Great disadvantages result from this, some of which are as follows: As the bars present large surface to the lire, they cannot be sufficiently cooled by the passing air, and they consequently become rapidly burnt. The fuel lying on the bars does not receive its proper supply of air from combustion. Glinkers are therefore formed, which interfere with the combustion, and necessitate a great reduction of the heat during their removal. Owing to the wide spacing ofthe bars, small coal can not be used, as it falls through to the ash-pit, and even if it be agglomerated at considerable expense into blocks, these blocks frequently in the act of combustion become disintegrated, and the material of which they are composed falls through the grate unconsumed.

My invention relates to a construction and arrangement of fire-grate suitable for the furnaces of steam or other boilers, and for furnaces of other kinds, devised so as to obviate the disadvantages mentioned above, and to secure complete `combustion of the fuel, to prevent small coal or dust from falling through the grate, and to provide great strength of grate, combined with lightness of bars, the nature of which will be hereinafter fully explained.

e In the accompanying drawings, Figure l shows a side view of one of the side frames of the improved fire-grate. Fig. 2 represents a longitudinal section,and Fig. 3 a plan, of the fire-grate. Fig. 4 shows a side view and transverse sections of the bearing-bars, and Fig. 5 is a transverse section 'through the fire-grate.

At each side is fixed a strong side frame, a, which may be made with anges for laying on brick-work, as shown in 5. To these side frames are bolted, by angle-brackets n, bearing-bars b, shaped like inverted troughs, with holes m through them, for free passage of air.

The fire-bars c c care made thin and closely spaced, and are of open triangular shape, to give great vertical strength. They rest at each end on the bearing-bars b, and also in the middle on stretching-bolts d, whichunite the two side frames a. The holes c in the bars, through which the bolts d pass, are slotted so as to allow for expansion or contraction of the bars.

It will be seen that the side frames a are curved vertically, and the fire-bars are laid on this curved form, and that each length of bar rests at the one end, c1, on a bearingbar, and at the other end, c2, on a curved seating, c3, formed 011 the end of the next length of bar. Thus the bars are free to move a little longitudinally, when expanded or contracted, without being strained or bent vertically.

At the ends the bars are widened out, as usual, so as to abut on each other laterally. They are also provided with studs about the middle of their length, each of which abuts on the side of theadjacent bar. The bars being thus confined at their ends and middle, between the two side frames, are kept from bending horizontally. The open form of the fire-bar, while it gives great vertical strength, renders the bar light, so that it can easily be moved and replaced by hand, and allows free play to the entering air over all its surface, so as to prevent it from being overheated;

and further, the weight of the fire, instead of being thrown, as usual, on bars supported at the-ends only, is borne by bars supported at three points, and transferred by them to the strong sideframes, through the bearing-bars and stretching-bolts. By this arrangement the old lire-grate is made, as it were, to be in one piece, expanding and contracting together, and the bars, being relieved of much of the strain to which nre-bars are usually subjected, can be made thin and closely spaced, so as to aiord uniform access of air to the Whole of the fuel7 and to permit fuel in small particles to be burnt upon them.

Having thus described my invention, what I claim, and desire to secure by Letters Patent7 1s 1. rllhe combination, With the side frames a, stretching-bolts d, and bearing-bars b, of a series of fire-bars, c, adapted to rest on the bearing-bars b, and in the center on the bolt d, substantially as described.

2. In a furnace-grate, a series of fire-bars,

c, of open triangular form, having seatngs at their ends c2, adapted to rest in seatings c2 in adjoining bars, and supported at their ends 01 on bearing-bars b, and in the center on stretching bolts d, passing through slots e, substantially as described.

In Witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

CHARLES KNOBLAUCH.

Witnesses ADoLF KNOBLAUCH, G. HENRY HoRsTMANN. 

